Unrestricted Spell (自在法,Jizaihō?) is the general term used for powerful magic spells in which Power of Existence is consumed. Spells classified under this term can be used for any purpose, and sometimes requires time and/or an incantation for it to activate. Sometimes, they also require a specific insignia (自在式,Jizai-shiki?) to activate. One who excels at the use of Unrestricted Spells is called a Master (自在師,Jizaishi?)

It is an Unrestricted Spell created by Dantalion that was given to Yuji Sakai when he merges with the Snake of the Festival. It allows him to manipulate his hair to be used offensively and defensively and can even tear a tall building in half or block Shana's flame blast.

It is an Unrestricted Spell uniquely owned and used by the Mystes, Yuji Sakai. It is entirely Yuji's own spell, not influenced by the Snake of the Festival or anybody. It uses multiple spells to form several combinations which can create many different effects.

It is an Unrestricted Spell unique to Shana that can be used to remotely observe areas from far away, broadcast speech over a wide area, to determine the purpose of unrestricted spells, and able to sense Power of Existence in a large area.

It is an Unrestricted Spell that is unique to Shaher and her servants like Rofocale. The ceremony's aim is to summon Shaher's voice which is sent to every single person involving the Crimson Realm; Flame Haze and Denizens alike. This voice cannot be blocked meaning everyone will know about the news Shaher announces. Since it is a Divine Summoning, it requires one of her servants to become a sacifice to make it work.

The Unrestricted Spell in which "Destructive Blade" Sabrac is famous for. This causes all injuries caused by Sabrac's attacks to enlarge in size over time, ensuring most of his battles to sway in his favor. Later, Johann created a counter spell which breaks Stigma's effect and leads to Sabrac's defeat at Misaki City. After that battle, Sabrac refines the spell and names it "Stigmata".

It is an Unrestricted Spell inherited by Flame Haze of the title "Flame-Haired Burning-Eyed Hunter". Using up an enormous amount of Power of Existence, Alastor materializes in the living world, causing widespread damage in a large area. Flame Haze who use this spell usually loses all of their Power of Existence as requirement of the spell and dies.